// yield/thread/win32/mutex.cpp

// Copyright (c) 2011 Minor Gordon
// All rights reserved

// This source file is part of the Yield project.

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Yield project nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL Minor Gordon BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "yield/exception.hpp"
#include "yield/thread/mutex.hpp"

#include <Windows.h>

namespace yield {
namespace thread {
Mutex::Mutex() {
  hMutex = CreateEvent(NULL, FALSE, TRUE, NULL);
  if (hMutex == NULL)
    throw Exception();
}

Mutex::~Mutex() {
  CloseHandle(hMutex);
}

bool Mutex::lock() {
  DWORD dwRet = WaitForSingleObjectEx(hMutex, INFINITE, TRUE);
  return dwRet == WAIT_OBJECT_0 || dwRet == WAIT_ABANDONED;
}

bool Mutex::trylock() {
  DWORD dwRet = WaitForSingleObjectEx(hMutex, 0, TRUE);
  return dwRet == WAIT_OBJECT_0 || dwRet == WAIT_ABANDONED;
}

void Mutex::unlock() {
  SetEvent(hMutex);
}
}
}
